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"Ehang's rapid development has been based on the city's open, innovative business environment," Xiong said.

"Despite the strong commitment of the Chinese authorities, important challenges remain to curbing the spread of the disease and enforcing ASF prevention and control measures in the field," he said, citing reasons including that China possesses almost half of the world's pig population, often in high density enclosures, and that the ASF virus can survive long periods in both cold and hot conditions, and even in dried and processed pork products.

"Even if DoD is correct and China doubles its arsenal by 2030 to 400-500 warheads, China's arsenal will remain far smaller and less capable than that of the US and Russia," Kingston Reif, director of disarmament and threat reduction policy at the Arms Control Association, said in a Twitter post.

"Every time I took off the protective gear, my clothes and hair would be soaked with sweat," she says.

"Every day, I had to get up at 3 am to collect water from the nearest source. It was daybreak when I reached home," she recalled, adding that it took about two hours to walk to the nearest township to buy daily necessities and the road could be made impassible by rain and snow.